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try going to control panel, the system icon, hardware tab, divice manager, check to see if your sound card does not have a yellow ! icon next to it, if it does try right click, go to properties, and reinstalling it, it does help if the computer is hooked to the internet so it can find it automaticly over the internet.

Ok when you plugged in the USB sound did it "see" it... did it ask for "Drivers" Because this device MUST have drivers.. also ya may have to disable any onboard sound device ya may have via the BIOS setup menu. Generally these USB sound devices are real easy to install and use.. try it on another PC to be sure it is OK.. GL

Sija
First things First:
1) check your connectors back on the PC, I presume you use windows XP and sound drivers installed **
2) plug the speakers cable on back or front of your PC in the green (usually) connector.
3) see if sound is NOT mute on mixer , multimedia in control panel.**
4) If you can Enter your BIOS, try to enable sound, for onboard sound, if apply**
good Luck